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प्रश्न
Give reasons for the appearance of new combinations of characters in the F2 progeny.
उत्तर
The reason for the appearance of new combinations in the F2 generation is the Law of Independent Assortment which states that when two pairs of traits are combined in a hybrid, one pair of character segregates independent of the other pair of character.
The two or more genes are inherited independent of each other and they recombine in the zygote to form new combinations in F2 generation. For example, when a tall pea plant with round seeds is crossed with a short pea plant with wrinkled seeds, the gene controlling plant height (tall/short) segregate independent of the gene controlling seed shape (round/wrinkled) and they recombine in the zygote to form new combinations (tall and wrinkled seeds and short and round seeds).
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संबंधित प्रश्न
Appearance of new combinations in F2 generation in a dihybrid cross proves the law of_____________ .
- dominance
- segregation
- independent assortment
- purity of gametes
A geneticist interested in studying variations and patterns of inheritance in living beings prefers to choose organisms for experiments with shorter life cycle. Provide a reason.
Give appropriate biological/technical terms for the following:
A pair of corresponding chromosomes of the same size and shape, one from each parent.
Choose the correct answer:
If a homozygous tall plant is crossed with a heterozygous tall plant, the proportion of tall progeny would be ____________
Given below is a schematic diagram showing Mendel’s Experiment on sweet pea plants having axial flowers with round seeds (AARR) and Terminal flowers with wrinkled seeds (aarr). Study the same and answer the questions that follow :
(i) Give the phenotype of F1 progeny.
(ii) Give the phenotypes of F2 progeny produced upon by the self-pollination of F1 progeny.
(iii) Give the phenotypic ratio of F2 progeny.
(iv) Name and explain the law induced by Mendel on the basis of the above observation.
When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be ______.
The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to ______.
Which of the following crosses will give tall and dwarf pea plants in same proportions?
If linkage was known at the time of Mendel then which of the following laws, he would not have been able to explain?
Tall pea plants having green pods were crossed with dwarf pea plants having yellow pods. Out of 80 plants, how many are likely to be tall plants in the F2 generation?
